Power system

The CPU can control its own power by sending a signal to the power manager IC. This means that during power-up it has to quickly let the power manager know it wants to keep receiving power. Using the same signal, the CPU can shut itself (and the rest of the electronics) down.

A long press on the play button (M3) or the enter button (M6) causes a quick power-down/power-up sequence, allowing the user to reset the system even when the CPU has completely crashed.

Battery charging is done completely in hardware, software can only monitor whether the charger is active or not.